JP6251288B2 - Power control system, power control apparatus, and control method for power control system - Google Patents

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority based on Japanese Patent Application No. 2013-249687 filed on December 2, 2013, and the entire specification of these patent applications is referred to by reference. Reference is made to the present specification.

  The present invention relates to a power control system, a power control apparatus, and a control method for the power control system.

  As a power generation conditioner for a power generation system equipped with power generation equipment such as a solar panel, the system is connected to a commercial power system (hereinafter abbreviated as system as appropriate) and outputs AC power. There are known ones that enable independent operation that outputs alternating current power (see, for example, Patent Document 1).

  Further, as a power storage power conditioner of a power storage system including a power storage facility such as a storage battery that is charged by system power, as in the case of the power generation power conditioner described above, In addition, there has been known one that enables a self-sustained operation that outputs AC power regardless of the system (for example, see Patent Document 2).

JP 2007-049770 A JP 2008-253033 A

  By the way, in a power control system, it is required to centrally manage and operate a plurality of distributed power sources such as a solar battery, a storage battery, a fuel cell, and a gas generator. In particular, it is required to construct a system capable of managing efficient operation control among a plurality of distributed power sources without destroying the versatility on the distributed power source side.

  Therefore, an object of the present invention made in view of the problems as described above is to provide a power control system capable of managing efficient operation control among a plurality of distributed power sources without destroying the versatility on the distributed power source side, An object of the present invention is to provide a power control apparatus and a control method for a power control system.

In order to solve the above-described problems, a power control system according to the present invention includes:
A power control system having a power generation device that generates power while a current sensor detects a forward power flow,
A power control device having an output unit capable of outputting power from the other distributed power source in a state where the power generation device and the other distributed power source are disconnected from the system;
A pseudo output system capable of supplying a pseudo current that can be detected by the current sensor as a current in the same direction as a forward power flow by an output from at least one of the output unit and the power generation device;
A self-sustaining operation switch that is arranged between the power generation device and the other distributed power source, and is turned off during a grid operation, and is turned on during a self-sustaining operation by the distributed power source
It further includes a synchronous switch that synchronizes with the self-sustained operation switch, and causes the pseudo current to flow when the self-sustained operation switch is turned on.

The distributed power source includes a storage battery,
The pseudo output system for supplying the pseudo current is configured to select and supply at least a binary pseudo current,
When the storage battery is fully charged, it is preferable that a small current value is selected from the at least two pseudo-currents.

Further, among the at least two pseudo-currents, a large current value i ₁ [A] is i ₁ > X / (Vg) with a predetermined value X [W] specified by the characteristics of the power generation device. (Vg is the output voltage [V] from the power generator), and the small current value i ₂ [A] is in the relationship of i ₂ <X / (Vg) with the predetermined value X [W]. It is preferable to satisfy.

Further, the supply of the pseudo current to the current sensor is performed by winding a wire to which the pseudo current in the pseudo output system is supplied to the current sensor by a predetermined number of turns n [times],
Among the at least two pseudo-currents, a large current value i ₁ [A] is i ₁ > X / (n · Vg) with a predetermined value X [W] specified by the characteristics of the power generator. (Vg is the output voltage [V] from the power generator), and the small current value i ₂ [A] is i ₂ <X / (n · Vg) between the predetermined value X [W]. It is preferable to satisfy the relationship.

  Further, the pseudo output system is preferably formed by connecting two or more series connection combinations of resistors and switches in parallel.

The at least binary pseudo-current has a ternary pseudo-current, and the largest current value i ₃ [A] among the ternary pseudo-currents is specified by the power generation start current value of the power generator. Satisfying the relationship of i ₃ > Y / (Vg) (Vg is the output voltage [V] from the power generator), and the second largest current value i ₁ [A] is Between the predetermined value X [W] and the predetermined value Y [W] specified by the characteristics of the power generator, the relationship of i ₁ > X / (Vg) and i ₁ <Y / (Vg) is satisfied, The smallest current value i ₂ [A] preferably satisfies the relationship i ₂ <X / (Vg) with the predetermined value X [W].

Further, the supply of the pseudo current to the current sensor is performed by winding a wire to which the pseudo current in the pseudo output system is supplied to the current sensor by a predetermined number of turns n [times],
The at least binary pseudo-current has a ternary pseudo-current;
Among the ternary pseudo currents, the largest current value i ₃ [A] is i ₃ > Y / (n) with a predetermined value Y [W] specified by the power generation start current value of the power generator. Vg) (Vg is the output voltage [V] from the power generator) and the second largest current value i ₁ [A] is a predetermined value X [W] specified by the characteristics of the power generator and Satisfying the relationship of i ₁ > X / (n · Vg) and i ₁ <Y / (n · Vg) with the predetermined value Y [W], the smallest current value i ₂ [A] is It is preferable to satisfy the relationship of i ₂ <X / (n · Vg) with the predetermined value X [W].

Furthermore, in order to solve the above-described problems, a power control device according to the present invention is:
A power control device used in a power control system having a power generation device that generates power while a current sensor detects a forward power flow and another distributed power source,
In a state where the power generation device and the other distributed power supply are disconnected from the system, an output unit capable of outputting electric power from the other distributed power supply is provided,
By an output from at least one of the output unit and the power generation device, a pseudo current that is a current in the same direction as a forward current can be supplied to the current sensor,
A self-sustained operation switch that is turned off at the time of grid operation and turned on at the time of self-sustained operation by the distributed power source, the self-sustained operation switch is arranged between the power generation device and the other distributed power source,
In synchronization with the self-sustained operation switch, a control unit that performs control for causing a pseudo current to flow when the self-supporting operation switch is turned on is provided.

Furthermore, in order to solve the above-described problems, a control method of the power control system according to the present invention includes:
A control method of a power control system having a power generation device that generates power while a current sensor detects a forward power flow and another distributed power source,
Outputting power from the other distributed power source in a state where the power generation device and the other distributed power source are disconnected from the grid; and
Supplying a pseudo current which is a current in the same direction as a forward current to the current sensor by an output from at least one of the power generation device and the other distributed power source;
A step of turning off a self-sustained operation switch disposed between the power generation device and the other distributed power source at the time of grid operation;
Turning on the self-sustaining operation switch during self-sustaining operation;
And a step of turning on a synchronous switch for allowing a pseudo current to flow when the self-sustaining operation switch is turned on.

  According to the power control system, the power control apparatus, and the control method of the power control system according to the present invention, efficient operation control among a plurality of distributed power supplies can be managed without destroying the versatility on the distributed power supply side. Is possible.

1 is a block diagram of a power control system according to a first embodiment of the present invention. It is a figure which shows the wiring regarding the pseudo output system of the electric power control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the wiring of a current sensor, a system | strain, and a pseudo output system in the electric power control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of control at the time of the grid operation of the electric power control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of control at the time of the independent operation of the electric power control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of control at the time of the independent operation of the electric power control system which concerns on the 1st Embodiment of this invention. It is a figure which shows the example of control at the time of the self-sustaining operation (at the time of storage battery charge completion) of the electric power control system which concerns on the 1st Embodiment of this invention. It is a block diagram of the electric power control system which concerns on other embodiment. It is a figure which shows the wiring regarding the pseudo output system of the power control system which concerns on other embodiment. It is a figure which shows the example of control at the time of the cooperation driving | operation of the electric power control system which concerns on other embodiment. It is a figure which shows the example of control at the time of the independent operation of the electric power control system which concerns on other embodiment. It is a figure which shows the example of control at the time of the independent operation of the electric power control system which concerns on other embodiment. It is a figure which shows the example of control at the time of the self-sustained operation (at the time of storage battery charge completion) of the electric power control system which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
First, the power control system according to the first embodiment of the present invention will be described. The power control system according to the present embodiment includes a distributed power source that supplies power that can be sold and / or a distributed power source that supplies power that cannot be sold, in addition to the power supplied from the system (commercial power system). Prepare. A distributed power source that supplies power that can be sold is a system that supplies power by, for example, solar power generation. On the other hand, a distributed power source that supplies electric power that cannot be sold is generated by, for example, a storage battery system that can charge and discharge electric power, a fuel cell system that includes a fuel cell such as a solid oxide fuel cell (SOFC), and gas fuel. Gas power generation system. In the present embodiment, a solar cell as a distributed power source that supplies power that can be sold, a storage battery as a distributed power source that supplies power that cannot be sold, and a power generator that is a fuel cell or a gas generator. An example is provided.

  FIG. 1 is a block diagram showing a schematic configuration of a power control system according to the first embodiment of the present invention. The power control system according to the present embodiment includes a solar cell 11, a storage battery 12, a power conditioner 20 (power control device), a distribution board 31, a load 32, a power generation device 33, a current sensor 40, And a pseudo output system 50. Here, the power generation device 33 is configured by a fuel cell or a gas generator. The power control system normally performs an interconnection operation with the grid, and supplies power supplied from the grid and power from each distributed power source (solar battery 11, storage battery 12, and power generation device 33) to the load 32. In addition, the power control system performs a self-sustained operation when there is no power supply from the system, such as during a power failure, and supplies power from each distributed power source (solar battery 11, storage battery 12, power generation device 33) to each load (load 32, second power 1 pseudo current load 51 and second pseudo current load 54). When the power control system performs autonomous operation, each distributed power source (solar cell 11, storage battery 12, power generation device 33) is in a state of being disconnected from the system, and when the power control system performs interconnection operation, Each distributed power source (solar cell 11, storage battery 12, power generation device 33) is connected to the system in parallel.

  In FIG. 1, a solid line connecting each functional block represents a wiring through which power flows, and a broken line connecting each functional block represents a control signal or a flow of information to be communicated. The communication indicated by the broken line may be wired communication or wireless communication. For communication of control signals and information, various methods including each layer can be adopted. For example, communication by a short-range communication method such as ZigBee (registered trademark) can be employed. Moreover, various transmission media, such as infrared communication and power line communication (PLC), can be used. In addition, only various logical layers such as ZigBee SEP2.0 (Smart Energy Profile 2.0) and ECHONET Lite (registered trademark) are defined on the lower layers including the physical layer suitable for each communication. A communication protocol may be operated.

  The solar cell 11 converts sunlight energy into DC power. The solar battery 11 is configured such that, for example, power generation units having photoelectric conversion cells are connected in a matrix and output a predetermined short-circuit current (for example, 10 A). The type of solar cell 11 is not limited as long as it is capable of photoelectric conversion, such as a silicon-based polycrystalline solar cell, a silicon-based single crystal solar cell, or a thin-film solar cell such as CIGS.

  The storage battery 12 includes a storage battery such as a lithium ion battery or a nickel metal hydride battery. The storage battery 12 can supply electric power by discharging the charged electric power. In addition to the power supplied from the grid or the solar battery 11, the storage battery 12 can be charged with the power supplied from the power generation device 33 as described later.

  The power conditioner 20 (power control device) converts the direct current power supplied from the solar battery 11 and the storage battery 12 and the alternating current power supplied from the grid and the power generation device 33, and performs interconnection operation and independence. Operation switching control is performed. The power conditioner 20 includes an inverter 21, interconnection operation switches 22 and 23, a self-sustaining operation switch 24, and a control unit 25 that controls the entire power conditioner 20. Moreover, the power conditioner 20 is provided with the output part 26 (refer FIG. 2) for supplying alternating current power with respect to the pseudo output system 50 mentioned later. The interconnection operation switch 23 may be configured to be out of the power conditioner 20.

  The inverter 21 is a bidirectional inverter, converts the DC power supplied from the solar battery 11 and the storage battery 12 into AC power, and converts the AC power supplied from the system and the power generation device 33 into DC power. Convert to A converter that boosts the DC power from the solar battery 11 and the storage battery 12 to a certain voltage may be provided in the previous stage of the inverter 21.

  The interconnecting operation switches 22 and 23 and the self-supporting operation switch 24 are each configured by a relay, a transistor, and the like, and are on / off controlled. As illustrated, the self-sustaining operation switch 24 is disposed between the power generation device 33 and the storage battery 12. The interconnecting operation switches 22 and 23 and the independent operation switch 24 are switched synchronously so that both are not simultaneously turned on (or off). More specifically, when the interconnection operation switches 22 and 23 are turned on, the autonomous operation switch 24 is turned off synchronously, and when the interconnection operation switches 22 and 23 are turned off, the autonomous operation switch 24 is turned on synchronously. It becomes. Synchronous control of the interconnection operation switches 22 and 23 and the independent operation switch 24 is realized by hardware by branching the wiring of the control signal to the interconnection operation switches 22 and 23 to the independent operation switch 24. It goes without saying that the ON and OFF states for the same control signal can be set separately for each switch. Further, the synchronous control of the interconnection operation switches 22 and 23 and the independent operation switch 24 can be realized by software by the control unit 25. However, as an exception to the above control, when the power conditioner is off, only the grid operation switch 23 is turned on, and both the grid operation switch 22 and the independent operation switch 24 are turned off. Only supply power to the electrical panel.

  The control part 25 is comprised, for example with a microcomputer, and controls operation | movement of each part, such as the inverter 21, the interconnection operation switches 22 and 23, and the independent operation switch 24, based on the rise of a system voltage or the state of a power failure. The control unit 25 switches the interconnection operation switches 22 and 23 on and the independent operation switch 24 off during the interconnection operation. Moreover, the control part 25 switches the interconnection operation switches 22 and 23 off and the autonomous operation switch 24 on during the independent operation.

  The distribution board 31 distributes the power supplied from the grid during the grid operation to a plurality of branches and distributes it to the load 32. In addition, the distribution board 31 distributes the power supplied from a plurality of distributed power sources (solar cell 11, storage battery 12, and power generation device 33) to a plurality of branches and distributes them to the load 32 during the independent operation. Here, the load 32 is a power load that consumes power. For example, various electric appliances such as air conditioners, microwave ovens, and televisions used in homes, air conditioners or lighting fixtures used in commercial and industrial facilities, and the like. Machine, lighting equipment, etc.

  The power generation device 33 is configured by a fuel cell or a gas generator. A fuel cell includes a cell that generates direct-current power by a chemical reaction with oxygen in the air using hydrogen, an inverter that converts the generated direct-current power into 100V or 200V AC power, and other accessories. Prepare. Here, the fuel cell as the power generation device 33 is a system that enables supply of AC power to the load 32 without using the power conditioner 20, and is always designed to be connected to the power conditioner 20. The system may be a versatile system. The gas generator generates power with a gas engine using a predetermined gas or the like as fuel.

  The power generation device 33 performs power generation while the corresponding current sensor 40 detects a forward power flow (current in the power purchase direction). During power generation, a load following operation that follows the power consumption of the load 32 or a predetermined rated power value is performed. Perform rated operation with. The tracking range during load following operation is, for example, 200 to 700 W, and the rated power value during rated operation is, for example, 700 W. The power generation device 33 may perform a load following operation that follows the power consumption of the load 32 during the interconnection operation, and may perform a load following operation or a rated operation based on the rated power value during the independent operation.

  The current sensor 40 detects a current flowing between the system and the power generation device 33. In Japan, since the power generated by the power generation device 33 is defined as being unsellable, the power generation device 33 generates power when the current sensor 40 detects a reverse power flow (current in the power selling direction) to the grid side. To stop. While the current sensor 40 detects a forward power flow, the power generation device 33 performs power generation in a load following operation or a rated operation on the assumption that power can be supplied to the load 32 from itself. As will be described later, from the viewpoint of power consumption, the current sensor 40 is preferably disposed at a location where the current generated by the power generation device 33 does not flow during the self-sustaining operation in the power conditioner 20.

  Here, the power control system according to the present embodiment has a current (pseudo-current) in the same direction as the pseudo forward flow to the current sensor 40 through the pseudo-output system 50 in a state where the power generation device 33 and the storage battery 12 are disconnected from the grid. ). As a result, the power generation device 33 can be rated and the power generated by the power generation device 33 can be stored in the storage battery 12. Hereinafter, power storage by the pseudo current through the pseudo output system 50 will be described in detail.

  The pseudo output system 50 is capable of supplying a pseudo current that is a current in the same direction as the forward power flow to the current sensor 40. The pseudo output system 50 is a system that receives power supply from the output unit 26 of the power conditioner 20 or the power generation device 33, and includes a first pseudo current load 51, a second pseudo current load 54, a synchronous switch 52, and the like. The first pseudo current control switch 53 and the second pseudo current control switch 55 are provided. FIG. 2 is a diagram showing wiring related to the pseudo output system 50. In FIG. 2, the system is a single-phase three-wire of 200V. In this case, one of the voltage lines and the neutral line are connected to the pseudo output system 50 at the output unit 26. As shown in the drawing, the connection line to the pseudo output system 50 is wired so as to pass through the current sensors 40 installed on the two voltage lines. The pseudo output system 50 may be configured integrally with the power conditioner 20 or may be configured independently of the power conditioner 20.

  The first pseudo current load 51 and the second pseudo current load 54 are loads having different resistance values, which are appropriately provided for current adjustment in the pseudo output system 50. As the first pseudo current load 51 and the second pseudo current load 54, loads outside the pseudo output system 50 may be used. The synchronous switch 52 is for supplying a part of the electric power supplied from the power conditioner 20 or the power generator 33 to the pseudo output system 50 to the current sensor 40 as a pseudo current in the same direction as the forward flow. The first pseudo current control switch 53 and the second pseudo current control switch 55 are for preventing unnecessary power generation due to the pseudo current. The synchronous switch 52, the first pseudo current control switch 53, and the second pseudo current control switch 55 are configured by independent relays, transistors, and the like, and are independently turned on / off by the control unit 25 of the power conditioner 20. Be controlled.

  As shown in FIGS. 1 and 2, the first pseudo-current load 51 and the first pseudo-current control switch 53 are connected in series, and both the synchronous switch 52 and the first pseudo-current control switch 53 are turned on. Then, a pseudo current flows through the first pseudo current load 51. Similarly, the second pseudo current load 54 and the second pseudo current control switch 55 are also connected in series. When both the synchronous switch 52 and the second pseudo current control switch 55 are turned on, the second pseudo current load 54 is turned on. A pseudo-current flows through. As described above, the first pseudo-current load 51 and the second pseudo-current load 54 are loads having different resistance values, and any of the first pseudo-current control switch 53 and the second pseudo-current control switch 55 is used. Depending on whether it is turned on, the two pseudo current values can be switched and set. The binary pseudo-current value is switched according to the power generation state of the power generator as will be described later.

  The synchronous switch 52 is ON / OFF controlled in synchronization with the self-sustaining operation switch 24 of the power conditioner 20. That is, the synchronous switch 52 is turned off during the interconnected operation and is turned on during the autonomous operation, like the autonomous operation switch 24. More specifically, the synchronous switch 52 is a switch that synchronizes the disconnection / parallel switching with the system and the switching timing, and allows a pseudo current to flow at the time of disconnection and does not flow a pseudo current at the time of parallel. The synchronous control of the independent operation switch 24 and the synchronous switch 52 is realized by hardware by branching the wiring of the control signal to the independent operation switch 24 to the synchronous switch 52. Synchronous control of the independent operation switch 24 and the synchronous switch 52 can also be realized by software by the control unit 25.

  The output from the power generator 33 can be charged to the storage battery 12 during the self-sustaining operation. When the charging is not completed, the pseudo current value is set large by turning on the first pseudo current control switch 53 and turning off the second pseudo current control switch 55. On the other hand, when the charging of the storage battery 12 is completed, the pseudo current value is set small by turning off the first pseudo current control switch 53 and turning on the second pseudo current control switch 55. Here, the case where the charging of the storage battery 12 is completed indicates a case where the storage battery 12 is charged with electric power of a predetermined value or more. The control unit 25 may be configured to determine whether or not charging is completed through communication with the storage battery 12. When the charging of the storage battery 12 is completed during the self-sustained operation, the first pseudo current control switch 53 is turned off, and the second pseudo current control switch 55 is turned on, the pseudo current flowing through the current sensor 40 is reduced, and the power generator 33 Unnecessary power generation due to can be stopped.

  Here, the binary pseudo-current value will be described. The power generation device 33 in the power control system of the present embodiment has a rated power value of 700 W, and it is considered that about 35 W, which is 5%, has a power detection error. Therefore, for example, by setting the forward current 35W as the control target current value of the power generation device 33, the power generation device 33 reduces the power supplied from the system as much as possible while maintaining the forward power flow. It works to cover the supply. When the forward current detection value is 35 W or less in terms of output power, the amount of power generated by the power generator is decreased, and finally power generation is stopped.

  Therefore, in the present embodiment, when a pseudo-current value of two values is provided and a large pseudo-current value is selected, the output power conversion value of the pseudo-current detected by the current sensor is set to 35 W, which is a control target value. When a pseudo current value that is larger and smaller than the selected current value is selected, the output power conversion value of the pseudo current detected by the current sensor is made smaller than the control target value of 35 W. Thereby, when a large pseudo current value is selected, the power generation device 33 detects a pseudo current larger than the control target value by the current sensor and starts power generation. On the other hand, when a small pseudo-current value is selected, the power generation device 33 stops power generation because the pseudo-current generated by the current sensor is always below the control target value, but the current sensor detects a slightly forward current. In order to continue, the error of incorrect connection of the current sensor does not occur.

  FIG. 3 is a diagram showing the connection between the current sensor 40 and the system and the pseudo output system 50. In the ring-shaped current sensor 40, the system power line 60 from the system passes through the center, and the pseudo output wiring 61 from the pseudo output system 50 is wound by a predetermined number of turns. The more the pseudo output wiring 61 is wound around the current sensor 40, the greater the current in the forward flow direction can be detected with a small pseudo current.

Next, a method for determining a binary pseudo current value will be described. In this embodiment, when a large pseudo current value is selected, a pseudo current I ₁ corresponding to an output power of 100 W that is larger than 35 W, which is a control target value (predetermined value X), is generated, and a small pseudo current value is selected. In this case, it is considered that a pseudo current I ₂ corresponding to an output power of 20 W that is smaller than the control target value of 35 W is generated. The output voltage (Vg) of the power generator is AC 200V, and the number of turns (n) of the pseudo output wiring 61 wound around the current sensor is 10, and the pseudo current I ₁ to be generated by the pseudo output system 50, I ₂ is obtained by the following calculation.

I ₁ = 100/200/10 = 0.05 [A] Formula (1)
I ₂ = 20/200/10 = 0.01 [A] Formula (2)

Next, the I _1, the resistance value R ₁ of the first pseudo current load 51 for generating I _2, and method for determining the resistance value R ₂ for the second pseudo current load 54 will be described. As shown in FIG. 2, for the pseudo output system 50, one of the voltage lines and the neutral line are connected to provide a voltage of AC 100V. Accordingly, the resistance values R ₁ and R ₂ for generating the above I ₁ and I ₂ are obtained by the following calculations, respectively.

R ₁ = 100 / 0.05 = 2.0 × 10 ³ [Ω] Formula (3)
R ₂ = 100 / 0.01 = 1.0 × 10 ⁴ [Ω] Formula (4)

The pseudo current values I ₁ and I ₂ and the resistance values R ₁ and R ₂ obtained by the above calculation are only one embodiment, and as is clear from the equations (1) to (4), the turn of the pseudo output wiring 61 Various parameters can be selected depending on the number, the pseudo current value (equivalent output power value) to be supplied to the current sensor, and the like. For example, the pseudo output wiring 61 does not necessarily have to be wound around the current sensor 40 a plurality of times, and the current sensor 40 may detect a current equal to the pseudo current flowing in the pseudo output system 50. In that case, calculation may be performed with the number of turns (n) of the pseudo output wiring 61 being 1 in each equation.

  Hereinafter, a control example in the power control system according to the present embodiment will be described in detail with reference to the drawings.

  FIG. 4 is a diagram illustrating a control example of the power control system during the interconnected operation. In this case, each switch of the power conditioner 20 is controlled such that the interconnection operation switches 22 and 23 are turned on and the independent operation switch 24 is turned off. The switches of the pseudo output system 50 are controlled so that the synchronous switch 52 is turned off, and the first pseudo current control switch 53 and the second pseudo current control switch 55 are turned on or off according to the charge amount of the storage battery 12. The

  At the time of the interconnection operation, as indicated by a thick arrow in FIG. 4, AC 100V (or 200V) is supplied from the system and is supplied to the load 32. The power conditioner 20 charges the storage battery 12 by converting AC power from the system into DC power when charging of the storage battery 12 is not completed. In addition, the power conditioner 20 can convert the generated power of the solar cell 11 into AC power and reversely flow into the system, or sell surplus power. Further, the power conditioner 20 has a configuration capable of outputting power from the system and power from the distributed power source (solar battery 11 and storage battery 12) to the pseudo output system 50, but the synchronous switch 52 is off during the interconnection operation. Therefore, the pseudo current is not supplied to the current sensor 40. Since a forward flow (current in the power purchase direction) flows from the system to the current sensor 40, the power generation device 33 generates power and supplies power to the load 32 through the distribution board 31.

  Next, a control example of the power control system during the independent operation will be described with reference to FIGS. 5 and 6, it is assumed that charging of the storage battery 12 is not completed. In this case, each switch of the power conditioner 20 is controlled such that the interconnection operation switches 22 and 23 are turned off and the independent operation switch 24 is turned on. Each switch of the pseudo output system 50 is controlled such that the synchronous switch 52 is turned on, the first pseudo current control switch 53 is turned on, and the second pseudo current control switch 55 is turned off.

  FIG. 5 is a diagram illustrating power supply by the distributed power supply during the autonomous operation. During the independent operation, the power conditioner 20 outputs the power of the distributed power supply (solar battery 11 and storage battery 12) to the load 32 and the pseudo output system 50 via the autonomous operation switch 24.

  FIG. 6 is a diagram illustrating the power generation of the power generation device 33 by the pseudo current during the autonomous operation. As shown in FIG. 6, when the power generation device 33 generates power during the self-sustaining operation, power is supplied to the pseudo output system 50 by the power generation device 33. A part of the power supplied to the pseudo output system 50 is supplied to the current sensor 40 as a pseudo current. At this time, since the current sensor 40 detects a forward power flow (current in the power purchase direction), the power generation device 33 performs power generation in the load following operation or the rated operation. The distribution board 31 supplies the power generated by the power generation device 33 to the load 32 and supplies surplus power exceeding the power consumption of the load 32 to the power conditioner 20. The surplus power is converted into DC power by the inverter 21 through the self-sustained operation switch 24 in the power conditioner 20 and supplied to the storage battery 12.

  Thus, according to the present embodiment, the power conditioner 20 disconnects the power generation device 33 and the other distributed power sources (solar battery 11 and storage battery 12) from the system, and the self-sustained operation switch is turned on. A pseudo output system 50 capable of supplying power from the power generation device 33 or another distributed power source is provided, and a pseudo current that is a current in the same direction as the forward current is supplied to the current sensor 40 by the output from the pseudo output system 50. It can be supplied. This makes it possible to manage efficient operation control among a plurality of distributed power sources without destroying the versatility on the distributed power source side. More specifically, it is possible to cause the power generation device 33 to generate power by flowing a pseudo current through the current sensor 40 during the self-sustaining operation. In addition, since the power generation of the power generation device 33 is controlled using the pseudo current to the current sensor 40, it is not necessary to make any special changes to the power generation device 33 itself, and a general-purpose fuel cell system and gas power generation system can be diverted. There are advantages.

  Further, according to the present embodiment, the synchronous switch 52 is a switch that synchronizes the disconnection / parallel switching with the system and the switching timing, and allows a pseudo current to flow when disconnected and does not allow a pseudo current to flow when parallel. Accordingly, a pseudo current flows through the current sensor 40 during the independent operation disconnected from the system, while a pseudo current does not flow through the current sensor 40 during the connected operation parallel to the system, and the power generation device is erroneously generated. No reverse flow from 33 will occur.

  Further, according to the present embodiment, the self-sustained operation switch 24 is turned off during the grid operation, and is turned on during the self-sustained operation by the distributed power source, and the power generator 33 and other distributed power sources (the solar battery 11, Between the storage battery 12). As a result, the power generated by the power generation device 33 can be supplied to the other distributed power source through the self-sustained operation switch 24 during the self-sustaining operation.

  The storage battery 12 can be charged with electric power from the power generation device 33 when the self-sustaining operation switch 24 is turned on. Thereby, it is possible to store in the storage battery 12 surplus power that is generated by the power generation device 33 during the self-sustained operation and exceeds the power consumption of the load 32, for example.

  FIG. 7 is a diagram illustrating a control example of the power control system during the self-sustaining operation when the storage battery 12 is completely charged. In this case, each switch of the power conditioner 20 is controlled such that the interconnection operation switches 22 and 23 are turned off and the independent operation switch 24 is turned on. In addition, each switch of the pseudo output system 50 is controlled such that the synchronous switch 52 is turned on, the first pseudo current control switch 53 is turned off, and the second pseudo current control switch 55 is turned on.

  When charging of the storage battery 12 is completed, the first pseudo current control switch 53 is turned off and the second pseudo current control switch 55 is turned on, so that the power conditioner 20 or the power generator 33 is operated during the independent operation. The pseudo current generated by the power supplied to the pseudo output system 50 is as low as about 20 W in terms of output power. Therefore, since the current sensor 40 can detect only a forward power flow equal to or less than the control target value (35 W), the power generation device 33 gradually decreases the power generation amount and finally stops power generation. Therefore, no more current than necessary is output to the storage battery 12. However, since the current sensor 40 detects a slight forward flow, the current sensor 40 is not determined to be erroneously connected, and no error occurs.

  Thus, according to the present embodiment, the first pseudo-current control switch 53 and the second pseudo-current control switch 55 are configured so that, when the storage battery 12 is fully charged, the pseudo-current that is equal to or less than a threshold that can be generated by the power generation device 33. Therefore, it is possible to prevent the power generation device 33 from generating more power than necessary.

  In addition, according to the present embodiment, even when the charging of the storage battery 12 is completed, a slight current is allowed to flow so that it is not determined that the current sensor 40 is erroneously connected, and no error occurs.

  As shown in FIGS. 1, 4 to 7, the current sensor 40 is preferably arranged in the power conditioner 20 at a location where a current generated by the power generation device 33 does not flow during the self-sustaining operation. This is because, if the current sensor 40 is arranged at a location where a current generated by the power generation device 33 flows, it is necessary to output a pseudo current for generating the power generation device 33 with power exceeding the current generated by the power generation. This is because power consumption increases. That is, by disposing the current sensor 40 at a location where the current generated by the power generation device 33 does not flow during the self-sustained operation in the power conditioner 20, it is possible to reduce the power consumption related to the pseudo current.

  In the present embodiment, the two pseudo current control switches are exclusively controlled so that only one of them is turned on, but the present invention is not limited to this form. The third pseudo current may be set by simultaneously turning on both pseudo current control switches.

(Second Embodiment)
The second embodiment of the present invention assumes a case in which the power generation device 33 starts power generation for the first time at a power larger than the above-described control target value (35 W: predetermined value X), for example, 200 W (predetermined value Y) or more. To do. That is, when a fuel cell is assumed as the power generation device 33, the fuel cell has low power generation efficiency at the time of low output, and therefore the threshold value for starting power generation is increased to about 200W. In such a case, in FIG. 1, 2, 3-7, it is possible to cope with this by adding another set of a series connection of a pseudo current load and a pseudo current control switch and providing a third pseudo current value. .

That is, at the start of power generation, both the pseudo current control switches 53 and 55 are turned off and the third pseudo current control switch is turned on to supply a pseudo current of, for example, 300 W of 200 W (predetermined value Y) or more. It can be constituted as follows. The third pseudo current value I ₃ required for this is I ₃ = 300/200/10 = 0.15 [A], and the value R ₃ of the third pseudo current load is R ₃ = 100. /0.15=6.67×10 ² [Ω] or so. After the power generation is started, the third pseudo current control switch is turned off and the second pseudo current control switch 55 is turned on, thereby moving to the same operation as in the first embodiment. The operation after full charge is the same as in the first embodiment.

(Other embodiments)
FIG. 8 is a block diagram illustrating a schematic configuration of a power control system according to another embodiment. The power control system according to another embodiment includes a solar cell 11, a storage battery 12, a power conditioner 120 (power control device), a distribution board 31, a load 32, a power generation device 33, and a current sensor 40. And a pseudo output system 150. This embodiment is different from the embodiment shown in FIG. 1 in that the current sensor 40 is disposed between the grid operation switch 23 and the distribution board 31, and the second pseudo current load 54 and the second pseudo current load 54. Since only the point that the pseudo current control switch 55 is not used is different, the description of the common part with FIG. 1 is omitted in the following description.

  Here, in the power control system according to another embodiment, when it is desired to cause the power generation apparatus 33 to start power generation, a current (pseudo current) in the same direction as the pseudo forward flow is supplied to the current sensor 40 through the pseudo output system 150. . As a result, the power generation device 33 can be rated and the power generated by the power generation device 33 can be stored in the storage battery 12.

  The pseudo output system 150 is capable of supplying a pseudo current that is a current in the same direction as the forward power flow to the current sensor 40. The pseudo output system 150 is a system that receives power supply from the output unit 26 of the power conditioner 120 or the power generation device 33, and includes a pseudo current load 51, a synchronous switch 52, and a pseudo current control switch 53. FIG. 9 is a diagram showing wiring relating to the pseudo output system 150. In FIG. 9, the power line from the distributed power source is a 200V single-phase three-wire. In this case, one of the voltage lines and the neutral line are connected to the pseudo output system 150. As shown in the drawing, the connection line to the pseudo output system 150 is wired so as to pass through the current sensors 40 installed in the two voltage lines. The pseudo output system 150 may be configured integrally with the power conditioner 120 or may be configured independently of the power conditioner 120.

  The pseudo current load 51 is a load that is appropriately provided for current adjustment in the pseudo output system 150. As the pseudo current load 51, a load outside the pseudo output system 150 may be used. The synchronous switch 52 is for supplying a part of the electric power supplied from the power conditioner 120 or the power generator 33 to the pseudo output system 150 to the current sensor 40 as a pseudo current in the same direction as the forward flow. The pseudo current control switch 53 is for preventing unnecessary power generation due to the pseudo current. The synchronous switch 52 and the pseudo current control switch 53 are configured by independent relays, transistors, and the like, and are independently controlled on / off by the control unit 25 of the power conditioner 120.

  As shown in FIGS. 8 and 9, the pseudo current load 51 and the pseudo current control switch 53 are connected in series, and when both the synchronous switch 52 and the pseudo current control switch 53 are turned on, the pseudo current load 51 A pseudo current flows.

  The synchronous switch 52 is ON / OFF controlled in synchronization with the self-sustaining operation switch 24 of the power conditioner 120. That is, the synchronous switch 52 is turned off during the interconnected operation and is turned on during the independent operation, like the autonomous operation switch 24. More specifically, the synchronous switch 52 is a switch that synchronizes the disconnection / parallel switching with the system and the switching timing. The synchronous switch 52 allows a pseudo current to flow when disconnected, and does not allow a pseudo current to flow when parallel. The synchronous control of the independent operation switch 24 and the synchronous switch 52 is realized by hardware by branching the wiring of the control signal to the independent operation switch 24 to the synchronous switch 52. Synchronous control of the independent operation switch 24 and the synchronous switch 52 can also be realized by software by the control unit 25.

  The output from the power generator 33 can be charged to the storage battery 12 during the self-sustaining operation. When the charging is not completed, the pseudo current control switch 53 is turned on so that a predetermined pseudo current flows. On the other hand, when the charging of the storage battery 12 is completed, the pseudo current control switch 53 is turned off so that the pseudo current does not flow. The control unit 25 may be configured to determine whether or not charging is completed through communication with the storage battery 12.

  Here, the setting of the pseudo current value in the present embodiment will be described. The power generator 33 in the power control system of the present embodiment has a rated power value of 700W. However, in FIGS. 8 and 9, when the power generation device 33 outputs 700 W of power, the current sensor 40 detects a reverse power flow corresponding to the output power of 700 W.

  Therefore, in this embodiment, power is supplied from the power conditioner 120 or the power generation device 33 to the pseudo output system 150, and a pseudo current for canceling the reverse power flow detected by the current sensor 40 is supplied. That is, it is configured to generate a pseudo current corresponding to an output power of 735 W or more so that the detection result of the current sensor is a forward power flow detection of 35 W or more in terms of output power.

In the present embodiment, a case is considered in which a pseudo current greater than 735 W and corresponding to an output power of 800 W is generated. When the output voltage of the distributed power source is 200 V AC and the number of turns of the pseudo output wiring 61 wound around the current sensor is 80, the pseudo current I ₃ to be generated in the pseudo output system is obtained by the following calculation. .

I ₃ = 800/200/80 = 0.05 [A] Formula (5)

Next, a method for determining the resistance value R ₃ of the pseudo current load 51 for generating I ₃ will be described. As shown in FIG. 9, for the pseudo output system 150, one of the voltage lines and a neutral line are connected to provide a voltage of AC 100V. Therefore, the resistance value R ₃ for generating I ₃ is obtained by the following calculation.

R ₃ = 100 / 0.05 = 2.0 × 10 ³ [Ω] Formula (6)

The pseudo current value I ₃ and the resistance value R ₃ obtained by the above calculation are only one embodiment, and depend on the number of turns of the pseudo output wiring 61, the pseudo current value (equivalent output power value) to be supplied to the current sensor, and the like. Various parameters can be selected.

  Hereinafter, a control example in the power control system according to the present embodiment will be described in detail with reference to the drawings.

  FIG. 10 is a diagram illustrating a control example of the power control system during the interconnected operation. In this case, each switch of the power conditioner 120 is controlled such that the interconnection operation switches 22 and 23 are turned on and the independent operation switch 24 is turned off. Each switch of the pseudo output system 150 is controlled so that the synchronous switch 52 is turned off and the pseudo current control switch 53 is turned on or off according to the charge amount of the storage battery 12.

  At the time of the interconnection operation, as indicated by a thick arrow, AC 100V (or 200V) is supplied from the system, and power is supplied to the load 32. When the charging of the storage battery 12 is not completed, the power conditioner 120 charges the storage battery 12 by converting AC power from the system into DC power. In addition, the power conditioner 120 can convert the power generated by the solar battery 11 into AC power and reversely flow into the system, or can sell surplus power. Further, the power conditioner 120 has a configuration capable of outputting power from the system and power from the distributed power source (solar battery 11 and storage battery 12) to the pseudo output system 150, but the synchronous switch 52 is off during the interconnection operation. Therefore, the pseudo current is not supplied to the current sensor 40. Since a forward flow (current in the power purchase direction) flows from the system to the current sensor 40, the power generation device 33 generates power and supplies power to the load 32 through the distribution board 31.

  Next, a control example of the power control system during the independent operation will be described with reference to FIGS. 11 and 12. 11 and 12, it is assumed that charging of the storage battery 12 is not completed. In this case, each switch of the power conditioner 120 is controlled such that the interconnection operation switches 22 and 23 are turned off and the independent operation switch 24 is turned on. Each switch of the pseudo output system 150 is controlled such that the synchronous switch 52 is turned on and the pseudo current control switch 53 is turned on.

  FIG. 11 is a diagram illustrating power supply by the distributed power supply during the autonomous operation. During the independent operation, the power conditioner 120 outputs the power of the distributed power source (solar battery 11 and storage battery 12) to the load 32 and the pseudo output system 150 via the autonomous operation switch 24.

  FIG. 12 is a diagram illustrating the power generation of the power generation device 33 by the pseudo current during the autonomous operation. As shown in FIG. 12, when the power generation device 33 generates power during the self-sustaining operation, power is supplied to the pseudo output system 150 by the power generation device 33. A part of the power supplied to the pseudo output system 150 is supplied to the current sensor 40 as a pseudo current. At this time, since the current sensor 40 detects a forward power flow (current in the power purchase direction) that cancels the reverse power flow from the power generation device 33 by the pseudo current, the power generation device 33 executes power generation in the load following operation or the rated operation. . The distribution board 31 supplies the power generated by the power generation apparatus 33 to the load 32 and supplies surplus power exceeding the power consumption of the load 32 to the power conditioner 120. The surplus power is converted into DC power by the inverter 21 through the self-sustaining operation switch 24 in the power conditioner 120, and is supplied to the storage battery 12.

  Thus, according to the present embodiment, the power conditioner 120 disconnects the power generation device 33 and the other distributed power sources (solar battery 11 and storage battery 12) from the system and turns on the self-sustaining operation switch. , Having a pseudo output system 150 capable of supplying power from the power generation device 33 or another distributed power source, and generating a pseudo current for canceling a reverse power flow from the power generation device 33 detected by the current sensor 40 and detecting a forward power flow. It can be supplied from the pseudo output system 150. This makes it possible to manage efficient operation control among a plurality of distributed power sources without destroying the versatility on the distributed power source side. More specifically, it is possible to cause the power generation device 33 to generate power by flowing a pseudo current through the current sensor 40 during the self-sustaining operation. In addition, since the power generation of the power generation device 33 is controlled using the pseudo current to the current sensor 40, it is not necessary to make any special changes to the power generation device 33 itself, and a general-purpose fuel cell system and gas power generation system can be diverted. There are advantages.

  Further, according to the present embodiment, the synchronous switch 52 is a switch that synchronizes the disconnection / parallel switching with the system and the switching timing, and allows a pseudo current to flow when disconnected and does not allow a pseudo current to flow when parallel. As a result, a pseudo current flows through the current sensor 40 during the self-sustained operation disconnected from the grid, while a pseudo current does not flow through the current sensor 40 during the linked operation parallel to the grid. There will be no reverse power flow from.

  Further, according to the present embodiment, the self-sustained operation switch 24 is turned off during the grid operation, and is turned on during the self-sustained operation by the distributed power source, and the power generator 33 and other distributed power sources (the solar battery 11, Between the storage battery 12). As a result, the power generated by the power generation device 33 can be supplied to the other distributed power source through the self-sustained operation switch 24 during the self-sustaining operation.

  The storage battery 12 can be charged with electric power from the power generation device 33 when the self-sustaining operation switch 24 is turned on. Thereby, it is possible to store in the storage battery 12 surplus power that is generated by the power generation device 33 during the self-sustained operation and exceeds the power consumption of the load 32, for example.

  FIG. 13 is a diagram illustrating a control example of the power control system during the self-sustaining operation when the storage battery 12 is completely charged. In this case, each switch of the power conditioner 120 is controlled such that the interconnection operation switches 22 and 23 are turned off and the independent operation switch 24 is turned on. The switches of the pseudo output system are controlled so that the synchronous switch 52 is turned on and the pseudo current control switch 53 is turned off.

  When the charging of the storage battery 12 is completed, the pseudo current control switch 53 is turned off, so that part of the electric power supplied from the power conditioner 120 to the pseudo output system 150 during the self-sustained operation becomes a current as a pseudo current. The sensor 40 is not supplied. As a result, neither the forward power flow nor the pseudo current from the system is detected by the current sensor 40, and the power generation device 33 stops power generation. Therefore, no more current than necessary is output to the storage battery 12.

  Thus, according to the present embodiment, the pseudo current control switch 53 stops the pseudo current when the charging of the storage battery 12 is completed, and thus it is possible to prevent the power generation device 33 from generating more power than necessary.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various changes or modifications based on the present disclosure. Therefore, it should be noted that these variations or modifications are included in the scope of the present invention. For example, the functions included in each member, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined into one or divided. Is possible.

  Many aspects of the present disclosure are presented as a series of operations performed by a computer system or other hardware capable of executing program instructions. Computer systems and other hardware include, for example, general-purpose computers, PCs (personal computers), dedicated computers, workstations, PCS (Personal Communications System, personal mobile communication systems), RFID receivers, electronic notepads, laptop computers, A GPS (Global Positioning System) receiver or other programmable data processing device is included. In each embodiment, the various operations are performed by dedicated circuitry implemented with program instructions (software) (e.g., individual logic gates interconnected to perform a specific function) or one or more processors. Note that the program is executed by a logic block, a program module, or the like. The one or more processors that execute logic blocks, program modules, and the like include, for example, one or more microprocessors, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), and a PLD. (Programmable Logic Device), FPGA (Field Programmable Gate Array), processor, controller, microcontroller, microprocessor, electronic equipment, other devices designed to perform the functions described herein, and / or any combination thereof Is included. The embodiment shown here is implemented by, for example, hardware, software, firmware, middleware, microcode, or any combination thereof. The instructions may be program code or code segments for performing necessary tasks. The instructions can then be stored on a machine-readable non-transitory storage medium or other medium. A code segment may represent any combination of procedures, functions, subprograms, programs, routines, subroutines, modules, software packages, classes or instructions, data structures or program statements. A code segment transmits and / or receives information, data arguments, variables or stored contents with other code segments or hardware circuits, thereby connecting the code segments with other code segments or hardware circuits .

  Unless otherwise specified, the network used here is the Internet, an ad hoc network, a LAN (Local Area Network), a cellular network, a WPAN (Wireless Personal Area Network) or other network, or any combination thereof. Is included. Examples of the components of the wireless network include an access point (for example, a Wi-Fi access point), a femto cell, and the like. Further, the wireless communication device includes Wi-Fi, Bluetooth (registered trademark), cellular communication technology (for example, CDMA (Code Division Multiple Access), TDMA (Time Division Multiple Access), FDMA (Frequency Division Multiple Access), OFDMA (Orthogonal Frequency). It can be connected to a wireless network using Division Multiple Access), SC-FDMA (Single-Carrier Frequency Division Multiple Access) or other wireless technologies and / or technical standards.

  The machine-readable non-transitory storage medium used herein can be further configured as a computer readable tangible carrier (medium) comprised of solid state memory, magnetic disk and optical disk categories, and so on. The medium stores an appropriate set of computer instructions such as a program module for causing a processor to execute the technology disclosed herein, and a data structure. Computer readable media include electrical connections with one or more wires, magnetic disk storage media, magnetic cassettes, magnetic tapes, and other magnetic and optical storage devices (eg, CD (Compact Disk), laser disks ( (Registered trademark), DVD (registered trademark) (Digital Versatile Disc), floppy (registered trademark) disk and Blu-ray Disc (registered trademark)), portable computer disk, RAM (Random Access Memory), ROM (Read-Only Memory), It includes a rewritable and programmable ROM such as EPROM, EEPROM or flash memory or other tangible storage medium capable of storing information or any combination thereof. The memory can be provided inside and / or outside the processor / processing unit. As used herein, the term “memory” means any type of long-term storage, short-term storage, volatile, non-volatile, or other memory in which a particular type or number of memories or storage is stored. The type of medium is not limited.

  It should be noted that here, a system having various modules and / or units that perform specific functions is disclosed, and these modules and units are schematically illustrated in order to briefly explain the functionality. It should be noted that the descriptions are not necessarily indicative of specific hardware and / or software. In that sense, these modules, units, and other components may be hardware and / or software implemented to substantially perform the specific functions described herein. The various functions of the different components may be any combination or separation of hardware and / or software, each used separately or in any combination. Also, input / output or I / O devices or user interfaces, including but not limited to keyboards, displays, touch screens, pointing devices, etc., may be connected directly to the system or via an intervening I / O controller. Can do. Thus, the various aspects of the present disclosure can be implemented in many different ways, all of which are within the scope of the present disclosure.

11 Solar cell 12 Storage battery 20,120 Power conditioner (power control device)
DESCRIPTION OF SYMBOLS 21 Inverter 22, 23 Interconnection operation switch 24 Self-supporting operation switch 25 Control part 26 Output part 31 Distribution board 32 Load 33 Electric power generation apparatus 40 Current sensor 50, 150 Pseudo output system 51 (1st) Pseudo current load 52 Synchronous switch 53 (First) Pseudo Current Control Switch 54 Second Pseudo Current Load 55 Second Pseudo Current Control Switch 60 System Power Line 61 Pseudo Output Wiring

Claims (9)

A power control system having a power generation device that generates power while a current sensor detects a forward power flow,
A power control device having an output unit capable of outputting power from the other distributed power source in a state where the power generation device and the other distributed power source are disconnected from the system;
A pseudo output system capable of supplying a pseudo current that can be detected by the current sensor as a current in the same direction as a forward power flow by an output from at least one of the output unit and the power generation device;
A self-sustaining operation switch that is arranged between the power generation device and the other distributed power source, and is turned off during a grid operation, and is turned on during a self-sustaining operation by the distributed power source
A power control system further comprising: a synchronous switch that synchronizes with the self-sustained operation switch and causes the pseudo current to flow when the self-supporting operation switch is turned on. The distributed power source includes a storage battery,
The pseudo output system for supplying the pseudo current is configured to select and supply at least a binary pseudo current,
2. The power control system according to claim 1, wherein when the storage battery is fully charged, a small current value is selected from the at least two pseudo-currents. Of the at least binary pseudo-currents,
The large current value i ₁ [A] is between i ₁ > X / (Vg) (Vg is the output voltage [V] from the power generator) and the predetermined value X [W] specified by the characteristics of the power generator. )
The power control system according to claim 2, wherein the small current value i ₂ [A] satisfies the relationship of i ₂ <X / (Vg) with the predetermined value X [W]. The pseudo current is supplied to the current sensor by winding a wire to which the pseudo current is supplied in the pseudo output system around the current sensor by a predetermined number of turns n [times].
Of the at least binary pseudo-currents,
The large current value i ₁ [A] is between a predetermined value X [W] specified by the characteristics of the power generator and i ₁ > X / (n · Vg) (Vg is an output voltage from the power generator [ V])
The power control system according to claim 2, wherein the small current value i ₂ [A] satisfies the relationship of i ₂ <X / (n · Vg) with the predetermined value X [W].   The power control system according to any one of claims 2 to 4, wherein the pseudo output system is formed by connecting in parallel two or more combinations of a series connection of a resistor and a switch. The at least binary pseudo-current has a ternary pseudo-current;
Of the ternary pseudo-currents,
The largest current value i ₃ [A] is between i ₃ > Y / (Vg) (Vg is an output from the power generator) and a predetermined value Y [W] specified by the power generation start current value of the power generator. Voltage [V])
The second largest current value i ₁ [A] is i ₁ > X / (Vg) between the predetermined value X [W] and the predetermined value Y [W] specified by the characteristics of the power generator. satisfies the relationship of i ₁ <Y / (Vg),
The power control system according to claim 2, wherein the smallest current value i ₂ [A] satisfies the relationship of i ₂ <X / (Vg) with the predetermined value X [W]. The pseudo current is supplied to the current sensor by winding a wire to which the pseudo current is supplied in the pseudo output system around the current sensor by a predetermined number of turns n [times].
The at least binary pseudo-current has a ternary pseudo-current;
Of the ternary pseudo-currents,
The largest current value i ₃ [A] is between a predetermined value Y [W] specified by the power generation start current value of the power generator and i ₃ > Y / (n · Vg) (Vg is from the power generator). Of the output voltage [V])
The second largest current value i ₁ [A] is i ₁ > X / (n · Vg) between the predetermined value X [W] and the predetermined value Y [W] specified by the characteristics of the power generator. ) And i ₁ <Y / (n · Vg)
The power control system according to claim 2 , wherein the smallest current value i ₂ [A] satisfies the relationship of i ₂ <X / (n · Vg) with the predetermined value X [W]. A power control device used in a power control system having a power generation device that generates power while a current sensor detects a forward power flow and another distributed power source,
In a state where the power generation device and the other distributed power supply are disconnected from the system, an output unit capable of outputting electric power from the other distributed power supply is provided,
By an output from at least one of the output unit and the power generation device, a pseudo current that is a current in the same direction as a forward current can be supplied to the current sensor,
A self-sustained operation switch that is turned off at the time of grid operation and turned on at the time of self-sustained operation by the distributed power source, the self-sustained operation switch is arranged between the power generation device and the other distributed power source,
A power control apparatus comprising: a control unit that performs control for causing a pseudo current to flow when the self-sustained operation switch is turned on in synchronization with the self-sustained operation switch. A control method of a power control system having a power generation device that generates power while a current sensor detects a forward power flow and another distributed power source,
Outputting power from the other distributed power source in a state where the power generation device and the other distributed power source are disconnected from the grid; and
Supplying a pseudo current which is a current in the same direction as a forward current to the current sensor by an output from at least one of the power generation device and the other distributed power source;
A step of turning off a self-sustained operation switch disposed between the power generation device and the other distributed power source at the time of grid operation;
Turning on the self-sustaining operation switch during self-sustaining operation;
And a step of turning on a synchronous switch for allowing a pseudo current to flow when the self-sustained operation switch is turned on.

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